Apogee APL-220, Руководство пользователя

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horn to the enclosure. On the APL-500, this is most easily accomplished by
using a ball-headed Allen wrench. Pull up on the horn to unseat it from the
gasket. The next step is to lift the horn away from the enclosure and reach in
through the cone driver opening to remove the 7/
1 6" hex nuts that retain
the driver to the horn. This is easier to accomplish with two people – one
holding the horn and one removing the nuts. Make sure to support the driv-
er with one hand as the nuts are being loosened to avoid damage. Once the
nuts are free, you can disconnect the wires to the HF driver and lift it out
through the cone driver opening. To replace the HF driver, simply reverse the
disassembly process.
There are no user serviceable parts inside the compression driver. It is not
possible to change the diaphragm without detailed knowledge of the proper
procedure and access to the necessary test equipment. If you attempt to
change the diaphragm without the required test equipment, performance
may be seriously degraded.
Replace the compression driver with a new or rebuilt unit by reversing the
procedure described above. Once the enclosure is fully reassembled, test it
to verify that it is operating properly by comparing it to a speaker of the
same model that is known to be performing properly.
(2) Processor / Amplifier Removal & Replacement
Before attempting service work, be certain to disconnect the power cable
from the unit. Lethal voltages are present inside the enclosure when the unit
is connected to an AC mains supply!
The processor/amplifier package consists of a heat sink assembly attached to
the rear of the APL-220, -500, or -800. It is accessible only from the rear of
the loudspeaker. The heat sink is held in place by twelve (
1
2) Philips drive
fasteners.
Once the fasteners are free, the unit can be removed. Because the gasket may
tend to stick, you may need to provide a little force to the top and bottom
of the heat sink’s fins to pull it free.
Once free, the processor/amplifier assembly can be easily disconnected from
the drivers. All interconnects are of the polarized quick-disconnect type.
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